This rollout is available from the Display panel. It provides controls that alter the display of hierarchical linkages.
Display Links: Displays a wireframe representation of the hierarchical link(s) affecting the selected object.
Link Replaces Object: Replaces the selected object with the wireframe representation of the hierarchical link. This option offers another way to reduce the geometric complexity of selected objects in a scene. See also Display Properties.
The Draw Links as Lines option in the Viewports panel of the Preferences dialog further reduces the display of links to a single line.